diff options
Diffstat (limited to 'src/superio/ite/it8728f/early_serial.c')
-rw-r--r-- | src/superio/ite/it8728f/early_serial.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/src/superio/ite/it8728f/early_serial.c b/src/superio/ite/it8728f/early_serial.c new file mode 100644 index 000000000000..7fbd061ab08a --- /dev/null +++ b/src/superio/ite/it8728f/early_serial.c @@ -0,0 +1,71 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2006 Uwe Hermann <uwe@hermann-uwe.de> + * Copyright (C) 2013 Damien Zammit <damien@zamaudio.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ +#include "early_serial.h" + +/* Superio raw commands */ +static void it8728f_sio_write(device_t dev, u8 index, u8 value) +{ + pnp_set_logical_device(dev); + pnp_write_config(dev, index, value); +} + +static void it8728f_enter_conf(device_t dev) +{ + u16 port = dev >> 8; + + outb(0x87, port); + outb(0x01, port); + outb(0x55, port); + outb((port == 0x4e) ? 0xaa : 0x55, port); +} + +static void it8728f_exit_conf(device_t dev) +{ + it8728f_sio_write(dev, IT8728F_CONFIG_REG_CC, 0x02); +} + +/* Superio low level commands */ +void it8728f_reg_write(device_t dev, u8 index, u8 value) +{ + it8728f_enter_conf(dev); + it8728f_sio_write(dev, index, value); + it8728f_exit_conf(dev); +} + +void it8728f_24mhz_clkin(device_t dev) +{ + it8728f_reg_write(dev, IT8728F_CONFIG_REG_CLOCKSEL, 0x1); +} + +void it8728f_enable_serial(device_t dev, u16 iobase) +{ + /* (1) Enter the configuration state (MB PnP mode). */ + it8728f_enter_conf(dev); + + /* (2) Modify the data of configuration registers. */ + pnp_set_logical_device(dev); + pnp_set_enable(dev, 0); + pnp_set_iobase(dev, PNP_IDX_IO0, iobase); + pnp_set_enable(dev, 1); + + /* (3) Exit the configuration state (MB PnP mode). */ + it8728f_exit_conf(dev); +} |